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Considering the heat in his area, along w/ the fact the BMW decided to Essam's car w/ extra climate control measure, I'd run nothing but 98 RON just to prevent knocking in that kind of heat as little as possible.
As for John, his climates aren't any different than what I got in Seattle, so I'd stay in the middle of the 91-98 RON if it was me.
I know there are conflicting opinions about using higher vs lower octane, but using the cheap or too low of an octane in BMW's has never served me well. This is my .02, but using the highest recommended octane will net better gas mileage as opposed to using lower octane in an effort to save money because you will get worse gas mileage, making the cheaper stuff a wash anyways.
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650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's
135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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